Flow checking apparatus



FIG. 1 is a perspective view of a flow checking apparatus in accordancewith the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

CLAIM The ornamental design for flow checking apparatus, as shown anddescribed.